tl;dr version:- I never print about A4, will i notice the optical inferiority of the VC over the non-VC.
I have a 7D with a 18-55mm (non-IS) lens. I use it a lot. I want a faster lens, with better quality glass as I use it alot.
I have 3 options:
Canon EF-S 17-55mm f/2.8
Tamron 17-50mm VC
I have discounted the Canon, I cannot justify such an expensive upgrade today, I have just started photography and I do not need USM, FTM, super focusing or good IS right now.
Now I am going to buy for the VC model as it will give me the option of 4 stops of stabalisation when I need it and when I do not, I will just loose a tiny amount of sharpness in my image.
I normally make photobooks, small prints with my images, never above A4, will I ever notice this quality degredation in my final prints. Is a VC Tamron a mistake?
Video is somwthing that fascinates me and I play to play with alot. The VC will be a massive help for that.